34 52 700 Replacing the DSC hydraulic control unit
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION)
.
Necessary preliminary tasks
- Remove HYDRAULIC UNIT .
- Immediately close off all hydraulic connections with protective caps!
- Clean the DSC control unit on the outside.
IMPORTANT:
- The hydraulic unit must not be more than 7 years old.
- May only be replaced once. Check repair history!
- No longer install hydraulic unit if subjected to mechanical stress (dropped, impact).
- Then use lint-free cloths and cleaning agent free of mineral oil.
- Do not touch any contact surfaces on the connector, pressure sensor and control unit with the hand or objects.
IMPORTANT:
- Control unit (2) must not come into contact with dirt or moisture.
- Contacts must not be bent!
Release screws (1).
Firmly hold pump motor (3) together with valve block (4).
Carefully detach DSC control unit (2).
IMPORTANT:
- The white moulding compound at the base of the DSC control unit (2) serves as a seal and must not be removed.
- Do not touch the contacts of pressure sensors (A) and (B) at DSC hydraulic control unit (1) and DSC control unit (2); otherwise, they could corrode.
Take DSC hydraulic control unit (2) out of the original packaging (part number 67 97 896).
Place the DSC hydraulic unit (2) straight on control unit (1) without twisting.
Installation note:
Replace screws (3).
Tightening torque 34 51 1AZ
IMPORTANT:
- The hydraulic unit is completely sealed in the area of the pressure sensor connection only after complete assembly.
Installation note:
- When installing the hydraulic unit, only remove retaining tab (4) and screw plug (5) directly before connecting the brake lines.
- Brake line mix-up test:
- Bleed BRAKING SYSTEM .